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最近,笔者拜读了贵刊上谷巨平的文章《对“平面二次旋转”问题的探究》,受益匪浅.方法具有时代性.而在几年前,我校有个物理老师就问过我这样一个问题.图一(有关磁通量的问题)将矩形ABCD沿着边AB旋转θ(θ为锐角),再沿边AD旋转θ角,那么,旋转后的平面与原来的平面所成的角为多少
Recently, the author read the article “Investigating the Second Rotation of the Plane” by your article Sanggu Juping. It has benefited a lot. The method has a contemporary nature. And a few years ago, my school had a physics teacher and asked me about it. Such a problem. Figure 1 (of the magnetic flux problem) rotates the rectangle ABCD along the edge AB by θ (θ is an acute angle) and then rotates along the edge AD by the angle θ. Then, what is the angle between the rotated plane and the original plane?